A snapshot was drawn at the zoom on screen, so one taken with the page zoomed
out came out too coarse to read. It is now drawn at 300 ppi, or at the zoom
if that is finer, or as fine as the renderer draws in one tile: it stops at
4096 pixels a side and cuts a larger area short, which 300 ppi would reach on
any area over about 983 pt a side.